Grupa A
Grupa A
1. Dokazite jednakost:
cos100 ? cos500 ? cos700 =
3 .
8
2. Nacrtaj graf funkcije
f (x) = sin2x - 3cos2x.
3. Rijesite jednadzbe: a) sinx + sin3x + sin5x + sin7x = 0;
x b) sinx + tg = -2;
2 c) 3sin3x - cos3x = 1.
4. Rijesite nejednadzbe: 5
a) 2cos 2x - - 1 0; 12
x b) tg > 1;
2 c) 4sin2x - 8sinx + 3 0.
5. Rijesite sustav: 3
sinx ? cosy = 4 3
cosx ? siny = . 4
6. Odredite sve korijene jednadzbe 4cos2x + 4cos2x = 3,
3 koji se nalaze u intervalu , 1 .
4
1
Grupa B
1. Dokazite jednakost:
sin200 ? sin400 ? sin800 =
3 .
8
x x
2. Nacrtaj graf funkcije: f (x) = sin - 3cos .
2
2
3. Rijesite jednadzbe:
a) sin4x + sin2x = sin3x;
xx b) ctg + tg = 2sinx;
22
c) sin4x + 3cos4x = 2.
4. Rijesite nejednadzbe:
a) tg 2x + + 1 0; 12
x1 b) cos > ;
22 c) 6cos2x - 11cosx + 4 > 0.
5. Rijesite sustav:
tg x ? tg y = 1
2
(1)
x+y=
3
6. Odredite sve korijene jednadzbe
logx
sin (logx) = cos
.
2
2
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